Err one thing you can do with the hyphen upsmash that works in the same way as the Fsmash is to threaten your opponent with it. The instinct your opponent has against an hyphen upsmash is to shield or sidestep and then punish the ending lag. One thing my friend Dusty (as Mario) and I did at one of Inui's tourneys in princeton was HOLD the hyphen upsmash.
In the high paced game of brawl (lol, i said high paced and brawl in the same sentence) smashes are thrown out quickly to reduce dead time (time you can't do anything...lag? w.e). Your opponents are tuned to these kind of smashes and have the reflex of defend and punish.
Idk if you know my snapshot theory, but the general gist of it is to probe your opponent's reactions given certain situations. If you throw out a fireball, he'll likely powershield/shield. If you buffer something out of a short hop, do they counter attack, shield, spot dodge, or roll away if they are within range? Stuff like that.
In the case of the hyphen upsmash, if you find your opponent side stepping these, you can trick them by holding the smash while you slide. At Inui's tournament, I caught LOADS of people with this. I find myself getting caught in this all the time, and I'm fully aware of this strategy. It's reflex, and it's pretty **** hard to compensate for your opponent charging their smashes to throw you off.
Unless you're metaknight, who can just downsmash in answer to every situation.
Say you mix this strategy up...you have your opponent retreating to their shield. This becomes a game of shield pressuring now, and you have a high reward low/medium risk in doing so. You charge your hyphen smash the second stock after killing him the first time. Your opponent will not likely sidestep the second time, because this gets beat. He'll either shield or roll away. Varying the lengths you charge your smashes puts your opponent on the offense, which can be used to your advantage.
Of course this isn't an end all be all strategy, but you're sure to catch people by surprise by mixing it up.
Oh I'm sure EVERYONE does this
(Sarcasm on internetz? can't tell you if it's true or not).
Oh yeah, I kind of sidetracked with the upsmash discussion, i'll rate your video later, just wanted to answer your "when should you use it" question...even though i don't think i did xD>
